QA1 RCK52611 Rear Coilover Conversion Kit with Adjustable Panhard Bar Single Adjustable 170 lb Soft Springs

The QA1 RCK52611 is a bolt-on rear coilover conversion system engineered for 1963–1972 GM C10 trucks that retains the factory truck arms while upgrading to fully adjustable coilover performance. No cutting, welding, or custom fabrication is required — the kit installs directly onto the stock suspension geometry for a straightforward at-home installation.

Per-corner ride height is fully adjustable via the single adjustable coilover shocks paired with soft 170 lb/in., 12-inch high-travel springs, allowing you to dial in the exact stance you want. The coilovers are repositioned to the outside of the frame rail, closer to the wheel, for improved cornering stability and to free up space for popular aftermarket rear-mounted fuel tanks.

The included on-car adjustable panhard bar keeps the rear axle properly centered during cornering, and its multiple mounting locations allow roll center geometry correction to match the desired amount of drop — a critical detail for trucks that have been significantly lowered.

Key Features:

• Bolt-on rear coilover conversion — no cutting or welding required
• Single adjustable twin-tube coilover shocks for combined compression and rebound tuning
• Soft 170 lb/in. spring rate with 12-inch high-travel coilover springs
• On-car adjustable panhard bar with multiple mounting locations for roll center correction
• Coilovers relocated outside the frame rail for improved cornering stability
• Black powdercoated finish on suspension components; gray/silver spring finish
• Compatible with stock factory truck trailing arms
• Includes frame brackets, axle brackets, linkage assemblies, crossmember assembly, and all necessary hardware
• Select QA1 single adjustable shocks are eligible for a Limited Lifetime Warranty

The RCK52611 delivers a complete suspension transformation for restomod and street-performance C10 builds, combining an improved stance with genuinely better handling geometry — all without sacrificing the ease of a bolt-on installation.